Why Do So Many People Have Herpes?

Some estimates say nearly 90% of adults have one of two strains of herpes. With this number’s increase, why is there still no cure?

The Good Thing About Herpes (Live Science)
“The herpes family of viruses can have a surprising upside–it can protect against the bubonic plague and other bacterial contagions, at least in mice.”Herpes infected humans before they were human (Science Daily)
“Researchers have identified the evolutionary origins of human herpes simplex virus (HSV) -1 and -2, reporting that the former infected hominids before their evolutionary split from chimpanzees 6 million years ago while the latter jumped from ancient chimpanzees to ancestors of modern humans — Homo erectus — approximately 1.6 million years ago.”